package org.apache.lucene.index;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.util.UnicodeUtil;

final class TermVectorsTermsWriterPerThread extends TermsHashConsumerPerThread {

    final TermVectorsTermsWriter termsWriter;
    final TermsHashPerThread termsHashPerThread;
    final DocumentsWriter.DocState docState;

    TermVectorsTermsWriter.PerDoc doc;

    public TermVectorsTermsWriterPerThread(TermsHashPerThread termsHashPerThread, TermVectorsTermsWriter termsWriter) {
        this.termsWriter = termsWriter;
        this.termsHashPerThread = termsHashPerThread;
        docState = termsHashPerThread.docState;
    }

    // Used by perField when serializing the term vectors
    final ByteSliceReader vectorSliceReader = new ByteSliceReader();

    final UnicodeUtil.UTF8Result utf8Results[] = { new UnicodeUtil.UTF8Result(), new UnicodeUtil.UTF8Result() };

    @Override
    public void startDocument() {
        assert clearLastVectorFieldName();
        if (doc != null) {
            doc.reset();
            doc.docID = docState.docID;
        }
    }

    @Override
    public DocumentsWriter.DocWriter finishDocument() {
        try {
            return doc;
        } finally {
            doc = null;
        }
    }

    @Override
    public TermsHashConsumerPerField addField(TermsHashPerField termsHashPerField, FieldInfo fieldInfo) {
        return new TermVectorsTermsWriterPerField(termsHashPerField, this, fieldInfo);
    }

    @Override
    public void abort() {
        if (doc != null) {
            doc.abort();
            doc = null;
        }
    }

    // Called only by assert
    final boolean clearLastVectorFieldName() {
        lastVectorFieldName = null;
        return true;
    }

    // Called only by assert
    String lastVectorFieldName;

    final boolean vectorFieldsInOrder(FieldInfo fi) {
        try {
            if (lastVectorFieldName != null)
                return lastVectorFieldName.compareTo(fi.name) < 0;
            else
                return true;
        } finally {
            lastVectorFieldName = fi.name;
        }
    }
}
